532 1'ROCEEDIXGS OF THE NATIONAL MUSEUM. vol. xxvn. 



laying on May 127. Fupa-cases have been found at all seasons of the 

 year during the time the leaves remained upon the host plants, the 

 greater number of which are deciduous herbs. 



The females are gregarious when Qgg laying, frequently seven to 

 ten being on one leaf within a small radius. The habit of making a 

 circular disk of granular wax upon which to deposit the eggs is 

 noticeably marked in this species, and the leaves, even when large, are 

 often covered with these disks which may overlap each other, thus 

 confusing the different sets of eggs. 



Collected by Mr. Kuwana at AVright's, in the Santa Cruz Range, on 

 Trommon sj?.; by Mr. Edward M. Ehrhorn, in the foothills near 

 JMountain View, Santa Clara County, on the same plant and also on 

 SoJicJms oleraceus; by Miss Isabella McCracken, in Oakland, on 

 Convolvulus sepiiim,' by Mr. W. S. Atkinson, on horse chestnut {Aescu- 

 lits calif ornicd)^ San Francisquito Creek, campus, Leland Stanford 

 Junior University, and by the author on cultivated fuschia in Golden 

 Gate Park, San Francisco, and on the campus, Leland Stanford Junior 

 University; also found on Plantago inajoi\ Sonchus oleraceus, Solamim 

 douglasii^ Nicotiana, glauca^ and cultivated iris in the same locality; 

 on cultivated dahlia, iris, and Cherokee rose, in Alameda; on Opulasfer 

 capitatus^ Sonchus oleraceus, Lonlcera involucrata, and Solanuni doug- 

 lasii along the banks of Stevens Creek, from the valley to the lagoon 

 at its head in the Santa Cruz Range (or Sierra Morena Range), and 

 along the banks of San Francisquito Creek on the same food plants. 



The leaves of the plantain and Sonchus oleraceus (sow thistle) are 

 more thickly covered than are those of the other hosts; frequently 

 they are solidly incrusted with the immature forms; the leaves in 

 such cases are usually paler and thinner. 



The author has carefully observed this species on its many food 

 plants with a view of ascertaining if there was constant variation in 

 gross extei'nal structure caused l)y a great range of food plants, but 

 this experiment has shown only trivial differences, such as are conmion 

 among nearly all species. The test may have more result if made 

 seasonal. 



60. ALEYRODES ABUTILONEUS (Haldeman). 



Aleijrodes ahut'doncn Haldeman, Am. Jn. of Sci. and Arts, IX (1850), p. 108. — 

 SiGNORET, Am. de la Soc. Entom. de France, Dec, 1867, p. 397. 



61. ALEYRODES HUTCHINGSI, new species. 



Plate XXXVI, figs. 62-04. 



PujKi-case. — Size about 1.3 by 0.6 mm.: elliptical; without lens, the 

 case is brownish in color, but when mounted in Canada balsam and 

 viewed by reflected light it ranges from a dense lirown-black to semi- 

 transparent, pale, 3"ellow-brown. The former color when found in 

 semitransparent, 3'ellowish species is usually the result of parasitization. 



